Advertisements
Advertisements
प्रश्न
What is the role of cryolite in the extraction of aluminium?
उत्तर
The function of the cryolite is to lower the fusion temperature from 2050°C to 950°C and to enhance conductivity.
APPEARS IN
संबंधित प्रश्न
In the extraction of Al, impure Al2O3 is dissolved in conc. NaOH to form sodium aluminate and leaving impurities behind. What is the name of this process?
Explain the following methods to protect metals from corrosion:
Passivation
What is 'copper matte' ?
What is the role of the following compound-
SiO2 in the extraction of copper from copper pyrites?
Complete the following statement by selecting the correct alternative from the choices given:
A current liberates 0.50 g of hydrogen in 2 hours. The weight of copper (at. wt. = 63.5) deposited at the same time by the same current through copper sulphate solution is: ___________
Metal which is found in free state is:
Write the chemical reactions involved in the extraction of gold by cyanide process. Also give the role of zinc in the extraction.
Which of the following is not an ore of magnesiuim?
Pyrolusite is ______.
The ore that contains both iron and copper is ______.